Overview
The LF33CV-DG is a fixed low-dropout (LDO) voltage regulator produced by STMicroelectronics. This regulator is designed to provide a stable output voltage of 3.3V with a maximum output current of 500 mA. It is housed in a TO-220-3 package, making it suitable for a variety of applications requiring reliable voltage regulation. The LF33CV-DG features a very low dropout voltage, low quiescent current, and high supply voltage rejection, making it an efficient choice for power management in electronic systems.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 3.234 | 3.3 | 3.366 | V |
| Operating Input Voltage (VI) | - | - | 16 | V |
| Output Current (IO) | - | - | 500 mA | mA |
| Dropout Voltage (Vd) | 0.2 | - | 1.3 | V |
| Quiescent Current (Id) - ON mode | 0.5 | - | 2 mA | mA |
| Quiescent Current (Id) - OFF mode | 50 | - | 120 µA | µA |
| Supply Voltage Rejection (SVR) | - | - | 80 dB @ 120 Hz, 75 dB @ 1 kHz, 65 dB @ 10 kHz | dB |
| Output Noise Voltage (eN) | - | - | 50 µV (10 Hz to 100 kHz) | µV |
| Control Input Logic Low (VIL) | 0.8 | - | - | V |
| Control Input Logic High (VIH) | - | - | 2 V | V |
| Control Input Current (II) | - | - | 10 µA | µA |
| Output Bypass Capacitance (CO) | 2 | - | 10 µF | µF |
Key Features
- Very Low Dropout Voltage: The LF33CV-DG has a dropout voltage as low as 0.2 V, ensuring minimal voltage loss and high efficiency.
- Low Quiescent Current: The regulator features a quiescent current of 0.5 mA in ON mode and 50 µA in OFF mode, making it power-efficient.
- High Supply Voltage Rejection: With a supply voltage rejection of up to 80 dB at 120 Hz, this regulator provides stable output voltage despite input voltage variations.
- Low Output Noise: The output noise voltage is as low as 50 µV over the frequency range of 10 Hz to 100 kHz, ensuring a clean output voltage.
- Inhibit Function: The regulator includes an inhibit function, allowing for easy control of the output voltage.
- Wide Operating Temperature Range: The LF33CV-DG operates over a temperature range of -40°C to 125°C, making it suitable for various environmental conditions.
Applications
- Industrial Automation: Used in control systems, sensors, and other industrial automation equipment where stable voltage is crucial.
- Automotive Systems: Suitable for automotive applications due to its wide operating temperature range and robust performance.
- Consumer Electronics: Found in various consumer electronics such as audio equipment, medical devices, and other portable electronics.
- Telecommunications: Used in telecommunications equipment to ensure stable power supply to sensitive components.
Q & A
- What is the output voltage of the LF33CV-DG?
The output voltage of the LF33CV-DG is 3.3V.
- What is the maximum output current of the LF33CV-DG?
The maximum output current is 500 mA.
- What is the dropout voltage of the LF33CV-DG?
The dropout voltage is as low as 0.2 V.
- What is the quiescent current in ON and OFF modes?
In ON mode, the quiescent current is 0.5 mA, and in OFF mode, it is 50 µA.
- What is the supply voltage rejection of the LF33CV-DG?
The supply voltage rejection is up to 80 dB at 120 Hz.
- What is the output noise voltage of the LF33CV-DG?
The output noise voltage is as low as 50 µV over the frequency range of 10 Hz to 100 kHz.
- Does the LF33CV-DG have an inhibit function?
Yes, the LF33CV-DG includes an inhibit function.
- What is the operating temperature range of the LF33CV-DG?
The operating temperature range is -40°C to 125°C.
- In what package is the LF33CV-DG available?
The LF33CV-DG is available in a TO-220-3 package.
- What are some common applications of the LF33CV-DG?
Common applications include industrial automation, automotive systems, consumer electronics, and telecommunications equipment.
